thompson



J. S. THOMPSON Feb. 19 1924.

MOLD

2 Sheets-Sheet 1 Feb. 19 1924.

S. THOMPSON MOLD Filed N06.

20, 1923 2 Sheets-Sheet 2 w a y. Wf/ af vN r ix I Patented Feb. 19, 1924.

PATENT OFFICE.

JAIHIES S. THOMPSON, GE PELI'IAM, NEW YORK.

MOLD.

Application filed November 20, 1923.

To all whom may concern:

Be it known that 1, JAMES S. THOMPSON, a citizen of the United States, residing at Pelham, in the county of lVestchester and State of New York, have invented certain new and useful Improvements in Molds, of which the following is a specification.

This invention relates to permanent molds for making brake shoesor other castings, and its object is, generally, to increase the life and efficiency of those metal molds which have refractory sections therein forming the Walls or parts of the walls of the mold cavity.

I have found in actual practice with molds of this general description that if the corners and edges of the refractory sections are unprotected, they are liable to chip and spall. When this happens the efficiency of the mold is lessened to the extent of the chipping or spalling that has taken place, and further use of the mold will result in the production of a casting which lacks the desired configuration, and may result in loss of the casting and further damage to the mold. In any event, it becomes necessary, sooner or later, to replace the damaged sections of refractory -material, which involves a loss of the use of the mold during repairs as well as the cost of making the repairs.

My present invention has for its object to overcome these difiiculties by protecting the refractory material against chipping and spalling or other similar damage which may occur during casting operations or at other times.

To thisend my invention also has for its object to provide a metal protection formed by walls of the mold to enclose all except that face of the refractory material which constitutes a part of the mold cavity.

And the invention also has for its object to accomplish the desired results hereinbe- Serial No. 675,792.

lccted embodiments in the accompanying drawings, referring to Which Fig. 1 is a longitudinal sectional view of a mold adapted for casting a brake shoe and embodying my invention.

Figs. 2 and 3 are transverse sectional views on the lines 22 and 33 respectively of Fig. 1.

Fig. 4 is also a longitudinal sectional view of a mold showing a slightly different embodiment of the invention.

Fig. 5 .is a longitudinal sectional view illustrating still another embodiment of the invent-ion.

Figs. 6 and 7 are transverse sectional views on the lines 66 and 7 7 respectively of Fig. 5.

Fig. 8 is a longitudinal sectional view of a mold combining the features illustrated in Figs. 4 and 5.

lieferring to the drawings, the mold compris'es'a cope member 10 and a drag member 11 having a pouring gate 12 conveniently disposed through which the molten metal is poured into the mold cavity 13. Interengaging shoulders i i-15 are provided on the mold members to properly align one member with relation to the other and to hold them in aligned position during the casting operation. The pouring gate is located at the right end of the mold and interengaging shoulders are located on the opposing'faces of the moldme-mbers at the opposite end and at the sides of the mold.

My invention is adapted for use where the mold cavity walls are part refractory and part metal, as shown in Figs. 1 and 5, and also where the mold cavity walls are substantially all refractory as shown in Figs. 4c and 8. In Fig. 1 the walls of the mold cavity, at the ends 16 thereof, are left bare to chill the ends of the casting. A refractory section 17 in the drag and refractory sections 18 in the cope provide wall surfaces which will not chill the casting. A

reinforcing back and a steel lug 20 for a brake shoe, with a lug core 21, are held by wires 22, and a cross bar 23, in proper position in the mold cavity and in the sand plug 24. As shown in Figs. 13, the cope forms the top, one side and one end of the mold cavity, and the drag forms the bottom, one side and one end of the mold cavity; and the parting line extends down through the pouring gate to the top of the mold at one end of the mold cavity, along the top of the mold cavity atone side there of, and down the other end ;o-,, .the mold cavity to the bottom thereof and along the other side of the mold cavity at the bottom thereof.

' It is desirable that all except that face of the refractory material which is exposed in the mold cavity shouldhe protected by a facing of metal, and since portions of the refractory material in thedrag would abutagainst the refractory material of the cope at thepa 'ingline between the drag -a1icl cope, .l prom ide metal ribs '25 v at the parting line which protect the. refractory sections and form abutting surfaces betweenthe .two

rial exceptwhereit constitutes the wall or between thecope men:

members of the mold. These ribs preferably taper to a comparatively narrow or thin edge where they are exposed in the mold cavity and I have found; in practice that such a restricted area of metal in the wall of the mold cavity and in. association with the refractory sections will not produce an appreciable chilling of the casting or to any material extent affect the same. Lind it desirable and therefore providethe res atthe parting line wherever the refractory sec tions would otherwise abut and this provides,in,efi eet, recesses for the refractory material and enclosing the refractory matepart of the wall of the mold .c vity. These ribs form a protection for the' refractory sections and for the edges and corners thereof, and will prevent chipping, spalling and other damage, which, Ihave founc impractice, will occur sooner or later to a groaterior less degree unless the sectionsareprotected.

I also, finditdesirableto support and protect the. other edges, corners or faces. of the refractory material, and therefore I provide ribs 26 for the inner 6 d, of the refractory the mold ca 'ity. At the parting line and thedrag member the ribs 25 are provided-asheretofore describfid. Ribs 31 are, provided inv the cope,

to support the outer ends, of the refractory sectionsfi? and to hold them intheir recesses in the cope. These ribs are, located over the endings which are formed on a brakeshoe casting and whatever chill-in effect. they h are. is of no, material importance.

t this a the, refracthe scope of; the follfrnving ch refractory section 30 is ard in the cope toform the other end:

Fig. 5 illustrates a mold substantially like that of Fig. 1 with the refractory sections 33 in the cope supported andprotected attheir oi'itcr endsin undercut endselel; of the recesses which the sections are held, and also by the ribs 35 such as shown in Fig. 4. in this form of mold, as shown also in Figs. 6 and 7, the top and one end of the mold cavity are formed in the cope and the bottom, two sides and-one end of the mold cavity are formed in the drag, so that the parting line between the mohln einbers is at the top and one end, of the mold cavity. In this construction, 1 in those heretofore described, the refractory sections are, protected,

, against-abutting at the parting line by the )rovision of ribs 25. which are .shownto .be .01'111Gtl integrally, with the mold members, asin thcpther figures of the drawings.

Fig, 8 shows a mold substantially similar to that of-l ig, 4; except that the refractory sections are somewhat differently shaped. Thereflactory section 36 vnot only forms a part of thetop. wall, of the. mold cavity, but also forms the end wall 37 thereof. I

l have shown and described the ribs, as made integral with the mold members, which so far has proven to. be thesix-nplest, and bestway of making these .ribs lmt- I, would consider it Within-the scope of mypresent invention if the ribs were not made integral.

Lhavefound in practice that S-atisfaQtOry its are obtainable if the refractory material isplacedin themold membersin a plasor semi-plastic. condition and; dried, and

isthe-way Icontemplate making upthe mold This is a very simple, easy andeconomical method of applying the plastic. material, it; insures; awsr ug. fit, and canjbe quickly completed; But the, nefractoryseo;

o t may be pro id la he o m 0. lo -k and inserted in proper position in the mold mem ers I am aware that cl mes in the "iorm cont e spirit; and

3 ".QT; lr n* entitled to 11.- Withi I claim:

mold for anakingbrake shoes and other cast ngs, compr sing ametal dragand a ,metalcope and having a mold cavity therein, refractory section seated in said mold and having a face thereof; Wall surface of th mold cavity, the

ing faces of the refractory section being protected by the metal of the mold] a 2. A mold foinmaking brake shoes and other castings, comprising metal drag and a metal. l cope and having 2t.1llOl(l-(JEl"V1li \f there-1n, a refractory. section disposed in said mold and having itsinnermostface forming a wall surface in the mold cavity,

the remaining faces of the refractory material being embedded in th metal of the mold.

3. A mold for making brake shoes and other castings, comprising a metal drag and a metal cope and having a mold cavity therein, a refractory section disposed in said mold and having a face thereof forming a wall surface in the mold cavity, the faces of the refractorysection which are adjacent the first mentioned face being embedded in the metal of th mold.

at. A mold-for making brake shoes and other castings, comprising a metal drag and a metal cope and having a mold cavity therein, a refractory section disposed in said mold and having a face thereof forming a wall surface in the mold cavity, the marginal edges of said face being protected by the metal of the mold.

5. A mold for making brake shoes and other castings comprising a metal drag and a metal cope and having a mold cavity therein, a refractory section disposed in said mold and having a face thereof forming a wall surface in the mold cavity, the several marginal edges of the refractory section being protected by metal forming a wall surface in the mold cavity.

6. A mold for making brake shoes and other castings, comprising a metal drag and a metal cope and having a mold cavity therein, a refractory section seated in said mold and having a face thereof forming a wall surface in the mold cavity, and a rib disposed at the parting line between the drag and cope to protect a marginal edge of said face.

7 A mold for making brake shoes and other castings, comprising a metal drag member and a metal cope member and having a mold cavity therein, a refractory sectionseated in one of said members and having a face thereof forming a wall surface of the mold cavity, and a rib formed inter grally with the metal of said member and disposed at the arting line of said member to protect an e ge of said face forming a wall surface of the mold cavity.

8. A mold for making brake shoes and other castings, comprising a metal drag member and a metal cope member and having a mold cavity therein, one of said members having an undercut recesstherein, and a refractory section disposed in said recess and having a face thereof forming a Wall surface of the mold cavity.

9. A mold for making brake shoes and other castings, comprising a metal drag member and a metal cope member and having a mold' cavity therein, one of said members having an undercut recess therein, and a refractory section disposed in said recess and having a face thereof forming a wall surface of the mold cavity, the metal adjoining the marginal edges of said face being disposed substantially flush with said face.

10. In a mold for making brake shoes and other castings comprising a metal drag and a metal cope and having a mold cavity therein, interengaging shoulders formed on the parting surfaces of the cope and the drag to hold them in aligned position during the casting operation.

11. In a mold for making brake shoes and other castings, comprising a metal drag and a metal cope and having a mold cavity therein, interengaging shoulders formed on abutting faces of the cope and the drag to hold the cope and drag in aligned position during the casting operation.

12. In a mold for making brake shoes and other castings, comprising a metal drag and a metal cope and having a mold cavity therein, interengaging shoulders formed on the parting surfaces of the drag and the cope to prevent lateral displacement of the cope relative to the drag during the casting operation.

13. A mold for making brake shoes and other castings, comprising a metal drag and a metal cope and having a mold cavity therein, the parting line between the drag and cope being located between relatively thin ribs on the drag and cope.

14. A mold for making brake shoes and other castings, comprising a metal drag and a metal cope and having a mold cavity therein, recesses in said drag and cope, refractory sections disposed in said recesses to form wall surfaces for the mold cavity, and relatively thin metal ribs on the drag and cope to protect the marginal edges of said refractory sections.

15. A mold for making brake shoes, comprising a metal drag and a metal cope and having a mold cavity therein, a refractory section forming a wall surface for the mold cavity, and a metal protector overlying that part of the refractory section wherein the end lug of the shoe is formed.

16. A mold for making brake shoes and other castings, comprising a metal drag and a metal cope and having a mold cavity therein, the drag having a recess projecting beyond the ends of the mold cavity, and a re fractory section seated in said recess and forming a wall surface for the mold cavity.

17. A mold for making brake shoes and other castings, comprising a metal drag and a metal cope and having a mold cavity therein, the drag having a recess at the bottom and at one side of the mold cavity extending beyond the ends of the mold cavity, refractory material in said recess forming wall surfaces for the'mold cavity, and a metal protector for the marginal edges of the refractory material.

18. A mold for making brake shoes and 

